Select the correct answerIn Java, the toString() method is a part of the Object class. Which of the following statements about the toString() method is correct?A. The default implementation in the Object class returns the memory address of the object.B. The toString() method is automatically invoked when an object is created.C. Overriding the toString() method is mandatory for every Java class.D. The toString() method cannot be overridden by user-defined classes.OptionsC and DA and BOnly AOnly D
Question
Select the correct answerIn Java, the toString() method is a part of the Object class. Which of the following statements about the toString() method is correct?A. The default implementation in the Object class returns the memory address of the object.B. The toString() method is automatically invoked when an object is created.C. Overriding the toString() method is mandatory for every Java class.D. The toString() method cannot be overridden by user-defined classes.OptionsC and DA and BOnly AOnly D
Solution
The correct answer is "Only A". The default implementation of the toString() method in the Object class returns a string consisting of the class name, the at-sign character @, and the unsigned hexadecimal representation of the hash code of the object. This typically relates to the object's memory address. The toString() method is not automatically invoked when an object is created, it's not mandatory to override it in every Java class, and it can be overridden by user-defined classes.
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What is the return type of the toString() method in java.lang.Object class?A) ObjectB) StringC) voidD) Integer
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Analyze the following code. Please select all that apply. public class Test { public static void main(String[] args) { Object a1 = new A(); Object a2 = new Object(); System.out.println(a1); System.out.println(a2); } } class A { int x; @Override public String toString() { return "A's x is " + x; } } Group of answer choicesThe program cannot be compiled, because System.out.println(a1) is wrong and it should be replaced by System.out.println(a1.toString());When executing System.out.println(a1), the toString() method in the Object class is invoked.When executing System.out.println(a2), the toString() method in the Object class is invoked.When executing System.out.println(a1), the toString() method in the A class is invoked.
lect the correct answerWhich of these is supported by method overriding in Java?
String myString = new String("This is a string!");System.out.println(myString instanceof Object);What is the output that you get when you execute this snippet of code?
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